Number Eleven Grimmauld Place

On a block full of broken windows and rubbish, number eleven (neighbor to number twelve) is a Muggle household whose occupants have no idea that their neighbors even exist, much less that they are the members of the Order of the Phoenix. When Harry first saw this house, it had a stereo thudding in an upstairs room and a pile of “bulging bin-bags” outside its front gate (OP3).